The concentration and the type of ester plasticizer, either adipate or citrate, did not have a significant effect on the mechanical properties of the films produced from starch + PLA blends (Table 2). The films with adipate esters were characterized by greater elongation (120–148%), less tensile strength (0.6–0.9 MPa), and a lower Young’s modulus (1.6–3.8 MPa) than the films made with citrate esters. The linear structure of these compounds probably facilitated the interaction with PLA, which led to efficient plasticization. The similarity of the chemical structures and the compatibility between the plasticizer and the polymer determine the plasticization effi- ciency. From a molecular perspective, the plasticizer should be miscible and should have solubility close to that of the polymer, thus requiring less energy to merge or solvate (Murariu, Ferreira, Alexandre, & Dubois, 2008).
The concentration and the type of ester plasticizer, either adipate or citrate, did not have a significant effect on the mechanical properties of the films produced from starch + PLA blends (Table 2). The films with adipate esters were characterized by greater elongation (120–148%), less tensile strength (0.6–0.9 MPa), and a lower Young’s modulus (1.6–3.8 MPa) than the films made with citrate esters. The linear structure of these compounds probably facilitated the interaction with PLA, which led to efficient plasticization. The similarity of the chemical structures and the compatibility between the plasticizer and the polymer determine the plasticization effi- ciency. From a molecular perspective, the plasticizer should be miscible and should have solubility close to that of the polymer, thus requiring less energy to merge or solvate (Murariu, Ferreira, Alexandre, & Dubois, 2008).
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